test(trim-paths): make test adapt to macOS

crates/cargo-test-macro/src/lib.rs

@@ -221,6 +221,16 @@ fn has_command(command: &str) -> bool {
         }
     };
     if !output.status.success() {
+        // `strings` from Apple Xcode toolchain doesn't have `--version` flag.
+        // If we see "unknown flag" then we've found its existence!
+        if command == "strings"
+            && String::from_utf8(output.stderr.clone())
+                .expect("utf8")
+                .find("unknown flag")
+                .is_some()
+        {
+            return true;
+        }
         panic!(
             "expected command `{}` to be runnable, got error {}:\n\
             stderr:{}\n\

tests/testsuite/profile_trim_paths.rs

@@ -447,7 +447,7 @@ warning: unused variable: `unused`
         .run();
 }
 
-#[cfg(target_os = "linux")]
+#[cfg(unix)]
 #[cargo_test(requires_strings, nightly, reason = "-Zremap-path-scope is unstable")]
 fn object_works() {
     use std::os::unix::ffi::OsStrExt;
@@ -541,5 +541,7 @@ fn object_works() {
     let stdout = run_strings(bin_path).stdout;
     assert!(memchr::memmem::find(&stdout, rust_src).is_none());
     assert!(memchr::memmem::find(&stdout, registry_src_bytes).is_none());
+    // TODO: on macOS codegen unit partitions `.rcgu.o` are still there.
+    #[cfg(not(target_os = "macos"))]
     assert!(memchr::memmem::find(&stdout, pkg_root).is_none());
 }